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Resize WP_Mail Attachments
v1.2 · by Patabugen
Attempts to auto-resize the attachments of emails sent via wp_mail() in order to fit them within a predefined limit.
About this plugin
All email providers have a maximum email size. Postmark – for example – have a hard limit of 10mb.
For usability, it’s best not to ask your visitors to do their own image resizing. This plugin will automatically reduce any images (specifically anything which can be edited with the WP_Image_Editor) a little at a time to try and fit the limit.